Electric plug



June 16, 1931. M. A. ROLLMAN ELECTRIC PLUG Filed May 15, 1928 gwuewl ozMA$OLLM4IY sum/wage.

Patented June 16, 1931 UNITED STATES MICHAEL A. ROLLMAN, OF MOUNT JOY,PENNSYLVANIA ELECTRIC! PLUG Application filed May 15,

The object of this invention is to provide the plug with a handle whichmay be used for pullin it out of and putting it into the socket, to t usrelieve the conductor of strain,

this handle being laterally flexible so as to protect the cordedconductor from injury by frequent bending at the point of connectionwith the plug, as more fully hereinafter set forth.

In the drawings- Fig. 1 is a side elevation of my device complete;

Fig. 2 is a view artly in side elevation and partly in longitu inalsection; 5 Fig. 3 is a sectional perspective view of the knob at the endof the handle.

Referring to the drawings annexed by reference characters, 5 designatesthe body of the plug which carries, in the usual manner, the twoterminals 6 adapted to enter the usual slots in the socket part 7 of theplug outfit. The plug 5 is provided with a central passage through whichthe corded conductor 8 passes, the two wire conductors enclosed thereinbeing respectively connected to the usual binding-screws 9.

The bore of the plug 5 is threaded internally, and into this threadedportion of the bore is screwed the inner end of a spirallyribbed armor10 of well-known type. This armor is made, as usual, of a strip of sheetmetal flanged and wound spirally, with a little lost motion in the jointto give flexibility, so that the tubular armor may flex in any directionwith respect to the socket,

. as shown in dotted lines in Fig. 1. The inner end of the spiral tube10 is anchored in the socket by having its extreme inner edge reamed orflanged over at 11 against the in- 4 vterior shoulder formed in the boreof the socket, thus preventing the spiral tube from being pulled out ofthe socket. To lock the tube against being screwed into the socket, Iprovide a binding-screw 12 threaded through the wall of the socket andhaving its inner end 1928. Serial No. 277,865.

bind against the interior surface of the tube.

The tube 10 is made of suitable length to serve as a handle, andattached to the outer end is a pullin -knob 13, preferably of insulatingmateria This knob 13 is fastened to the spiral tube 10 in the samemanner that the socket 5 is fastened thereto, i. e., by screwing thetube into the ring-like knob and having its extreme outer edge peenedover at 14, a lock-screw 15 being threaded through the knob in bindingrelation with the tube to thus lock the knob against being screwedinwardly on the tube.

As will be seen, the tube 10 and the knob 13 form a handle for use indisconnecting the plug as well as ushing it into place in the socket.The ma 'ng of the tube 10 flexible enables it to flex in any direction,to thus prevent injury to the textile covering of the conductor 8 in themanipulations of the plug. The knob 13 is important in that it providesa good grip for the handle. The manner of fastening the ends of the tube10 into the plug at one end and into the pull-knob 13 at the other endnot only conduces to simplicity 7o and inexpensiveness, but provides asure, long-lasting connection.

What I claim as new is:

1. In combination with a plug provided with a pair of terminals andhaving an internally-threaded bore, a spiral flexible tube threaded intosaid bore and secured therein by flanging over the end of the tubeagainst an internal shoulder in the bore, and a bindingor set-screwcarried by the plug and adapted to bear against the tube to thus assistin locking the tube in the plug.

2. In an electrical plug, a body carrying the terminals and having abore or hole, a spiral flexible tube fastened in said bore, and apull-knob screwed onto the outer end of said tube and secured thereto byhaving its extreme outer edge flanged-over upon the knob, a set-screwbeing employed to lock the knob to the tube.

8. An electrical lug embodying a, plugbody having an internally-threaded bore, a. flexible iral armored tube screwed into saidbore an locked therein by flan g-over the inner end of the tube, and a p-kn0b at the outer end of said flexible tube fastened thereto by beingscrewed thereon and having the outer end of the-tube flanged-over on theknob.

In testimony whereof I hereunto afiix my signature.

MICHAEL A. ROLLMAN.

